Sitefinity's default rich text editor icons are not visible

Problem 7:

 Sitefinity's default rich text editor icons are not visible, and that happens in content bocks , in modules   and even in customs widgets. it looks like the following one.

Solution 7:

This problem can be  solved by simply find out the following line in your web.config file.

<add key="Telerik.EnableEmbeddedSkins" value="false" />
 

And comment out or delete that line.

<!--<add key="Telerik.EnableEmbeddedSkins" value="false" />-->